Unique Signature of Dark Matter in Ancient Mica
نویسندگان
چکیده
Mica can store (for > 1 Gy) etchable tracks caused by atoms recoiling from WIMPs. Because a background from fission neutrons will eventually limit this technique, a unique signature for WIMPs in ancient mica is needed. Our motion around the center of the Galaxy causes WIMPs, unlike neutrons, to enter the mica from a preferred direction on the sky. Mica is a directional detector and despite the complex rotations that natural mica crystals make with respect to this WIMP “wind,” there is a substantial dependence of etch pit density on present day mica orientation.
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